Abstract: This article is based on industrial computed tomography CT scanning technology, the three-dimensional reconstruction of pore microstructure and seepage characteristics of rock samples from the eastern tectonic area of Bailiang Coal Mining Area in Chenghe Mining Area, Weinan, Shaanxi Province were studied, and the purpose of the study was to explore the distribution of pore morphology and seepage characteristics with the depth change of fault structure.By filtering, binarizing and threshold segmentation of rock microscopic CT images, they are converted into digital images to provide image data for subsequent microscale model reconstruction, and the porosity and pore size distribution of different rock samples are analyzed.The results show that the porosity of the tested rock samples is mainly distributed between 2.66% and 6.69%,and increases with the increase of sampling depth, especially the porosity of the rock samples collected near the fault structure is higher.The change of porosity between different lithologies indicates that the lithological transition will lead to the rearrangement of pore structure, which in turn will affect the permeability.In the test samples, pore connectivity has a significant effect on the permeability, and the permeability of rock samples with more isolated pores is lower, while the permeability of rock samples with more connected pores is higher.As the sampling depth increases, the closer the distance from the tectonic fault, the tortuosity and pore structure complexity of the rock sample increase.